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require 'html/pipeline'
module Gitlab
module Markdown
# HTML filter that replaces commit references with links. References within
# <pre>, <code>, <a>, and <style> elements are ignored.
#
# This filter supports cross-project references.
#
# Context options:
# :project (required) - Current project, ignored when reference is
# cross-project.
# :reference_class - Custom CSS class added to reference links.
# :only_path - Generate path-only links.
#
class CommitReferenceFilter < HTML::Pipeline::Filter
include CrossProjectReference
# Public: Find commit references in text
#
# CommitReferenceFilter.references_in(text) do |match, commit, project_ref|
# "<a href=...>#{commit}</a>"
# end
#
# text - String text to search.
#
# Yields the String match, the String commit identifier, and an optional
# String of the external project reference.
#
# Returns a String replaced with the return of the block.
def self.references_in(text)
text.gsub(COMMIT_PATTERN) do |match|
yield match, $~[:commit], $~[:project]
end
end
# Pattern used to extract commit references from text
#
# The SHA1 sum can be between 6 and 40 hex characters.
#
# This pattern supports cross-project references.
COMMIT_PATTERN = /(#{PROJECT_PATTERN}@)?(?<commit>\h{6,40})/
# Don't look for references in text nodes that are children of these
# elements.
IGNORE_PARENTS = %w(pre code a style).to_set
def call
doc.search('text()').each do |node|
content = node.to_html
next if project.nil?
next unless content.match(COMMIT_PATTERN)
next if has_ancestor?(node, IGNORE_PARENTS)
html = commit_link_filter(content)
next if html == content
node.replace(html)
end
doc
end
def validate
needs :project
end
# Replace commit references in text with links to the commit specified.
#
# text - String text to replace references in.
#
# Returns a String with commit references replaced with links. All links
# have `gfm` and `gfm-commit` class names attached for styling.
def commit_link_filter(text)
self.class.references_in(text) do |match, commit_ref, project_ref|
project = self.project_from_ref(project_ref)
if project.valid_repo? && commit = project.repository.commit(commit_ref)
url = url_for_commit(project, commit)
title = commit.link_title
klass = "gfm gfm-commit #{context[:reference_class]}".strip
project_ref += '@' if project_ref
%(<a href="#{url}"
title="#{title}"
class="#{klass}">#{project_ref}#{commit_ref}</a>)
else
match
end
end
end
def url_for_commit(project, commit)
h = Rails.application.routes.url_helpers
h.namespace_project_commit_url(project.namespace, project, commit,
only_path: context[:only_path])
end
def project
context[:project]
end
end
end
end
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